yeah… try this
turn your car on… select vent and spray 1/4-1/2 can of lysol into the cowl intake with vent running. Shut off when done and let it sit for a good 12 hours or so… that should flush him out/kill him while also getting rid of any mildew/mold/odd smells…
although, if this is a new car (I think I remember reading that you got a new one) it may kill the new car smell a little